Question by Lê Quốc Trần Anh - Discuss with MathYouLike

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04/03/2018 at 04:25

The first three terms of a sequence are 1, 2 and 3. Each subsequent term is the sum of the three previous terms. What is the 11th term of this sequence?

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Jacob 05/03/2018 at 02:19

1,

2,

3,

1 + 2 + 3 = 6,

2 + 3 + 6 = 11,

3 + 6 + 11 = 20,

6 + 11 + 20 = 35,

11 + 20 + 35 = 66.

20 + 35 + 66 = 121,

35 + 66 + 121 = 222,

66 + 121 + 222 = 409

The 11th is 409
Lê Quốc Trần Anh selected this answer.

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